Answer: D. Acid from abandoned mines
Explanation:
Point source pollution can be define as the pollution that can be caused by a pollutant whose source of origin is known. As the source of origin is known the path of the pollutant can be traced back to it's origin hence, the pollution can be controlled. 
Among the options given, D. Acid from abandoned mines. is the correct option this is because of the fact that the source of origin of the pollutant is known that is abandoned mines. 
 
        
                    
             
        
        
        
Answer:
Explanation:
Exons can be shuffled  independently known as exon shuffling. It can be done in various ways, leading to infinite number of combinations to discover new and meaningful coding sequences hence various proteins. Due to exon shuffling, evolution need not  occur only by the slow accumulation of point mutations but  might also move ahead by “quantum leaps” with new proteins  appearing in a single generation.
 
        
             
        
        
        
For the answer to the question above, the answer is "<u>5-10%"</u> percentage of kilocalories in the food consumed is used for tef or 
<span>The thermic effect of food. I hope my answer helped you. Have a nice day ahead of you!</span>